Dwijaputra, I., 		Satriya Wibawa, I., & 		Wendri, N.
(2018).
 Designing CCTV Working Optimization System as Room Security Using Passive Infrared (PIR) Sensor Based on AT89S52 Microcontroller.
<em>BULETIN FISIKA, 19</em>(2), 46-51.
Retrieved from <a href="http://103.29.196.112/index.php/buletinfisika/article/view/38604" target="_new">http://103.29.196.112/index.php/buletinfisika/article/view/38604</a>